What you don't want to see on your computer when you're shutting down the house at night:

 

And, when I did a reboot, it didn't help.  Since that is the extent of my knowledge of how to fix anything on a computer, I went out to see if my resident IT specialist had gone to be yet (not likely, I go to be a lot earlier than he does!).  Luckily when AJ did the reboot, it popped back up and finished an update, so....whew!  Dodged that bullet!